VT1000/VT1200 & DECimage 1200

This document is the "VT1000/VT1200 and DECimage 1200 Service Guide" from Digital Equipment Corporation, published in 1990/1991. It is a comprehensive manual intended for Digital's Customer Services Engineers and qualified self-maintenance customers, providing instructions on how to service, troubleshoot, and maintain the VT1000, VT1200, and DECimage 1200 video terminals.

Key areas covered in the guide include:

• Terminal Overview: Describes the hardware components (system box, monitor, keyboard, mouse), operating features (X Window and Video Terminal sessions), network protocols (LAT, TCP/IP, TELNET), customization, password overriding, and site requirements.
• Testing: Details procedures for running terminal self-tests (power-up, menu-driven diagnostics, video alignment patterns) and remote diagnostic tests over VMS, ULTRIX, and UNIX systems (using NCP, LANSA, TELNET, and ping).
• Troubleshooting: Provides methods for diagnosing problems, including using flowcharts, interpreting screen error messages, and reading LED error codes, along with solutions for common general problems.
• Removing and Replacing FRUs (Field Replaceable Units): Offers step-by-step instructions for replacing various internal components such as the system box cover, RAM controller board, image board, SIMM cards, ROM board, system logic board, power supply, fan, keyboard, mouse, and printer.
• Starting a Session: Explains how to initiate and manage user sessions on VMS, ULTRIX, or UNIX systems, including setting up required network information, performing a secure reset to factory defaults, and displaying image customization dialogs.

The document also includes appendices listing related documents and recommended spare parts.